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Word Embedding 자질을 이용한 한국어 개체명 인식 및 분류
최윤수(Yunsu Choi),차정원(Jeongwon Cha) Korean Institute of Information Scientists and Eng 2016 정보과학회논문지 Vol.43 No.6
Named Entity Recognition and Classification (NERC) is a task for recognition and classification of named entities such as a persons name, location, and organization. There have been various studies carried out on Korean NERC, but they have some problems, for example lacking some features as compared with English NERC. In this paper, we propose a method that uses word embedding as features for Korean NERC. We generate a word vector using a Continuous-Bag-of- Word (CBOW) model from POS-tagged corpus, and a word cluster symbol using a K-means algorithm from a word vector. We use the word vector and word cluster symbol as word embedding features in Conditional Random Fields (CRFs). From the result of the experiment, performance improved 1.17%, 0.61% and 1.19% respectively for TV domain, Sports domain and IT domain over the baseline system. Showing better performance than other NERC systems, we demonstrate the effectiveness and efficiency of the proposed method.
KyungHee Choi,KyeChung Park,SunYoung Lee,YunSu Do 한국응용곤충학회 2011 한국응용곤충학회 학술대회논문집 Vol.2011 No.10
This research is aiming to develop generic attractants for lepidopteran pests that can be used as a control tool for environmentally friendly management against the lepidopteran pests in orchards. During the first year of this research we carried out various trapping experiments in apple orchards in Korea. Field trapping experiments were carried out at two apple orchards in UaiSung-Gun, GyungBuk Province during May – September 2010, using different rice wines and fruit-based fermenting baits. Overall, when six major moth pest species(Grapholita molesta, Carposina sasakii, Adoxophyes orana, Choristoneura longicellana, Archippus breviplicanus, Phyllonorycter ringoniella) in apple orchards were counted, 445 moths were captured in raw material-baited traps and 1,566 moths in sex pheromone-baited traps. There were no clear differences in the attractiveness to the moths between different kinds of rice wines and fruit baits when the attractiveness of fifteen different rice wines and seven fermenting fruit baits were compared in the apple orchards. One rice wine (‘Chung-ju’ rice wine) and fermenting pineapple showed somewhat higher attractiveness to G. molesta than other raw baits, which will be re-examined in 2011 – 2012 periods.
Seong Hye,Choi Yunsu,Kim Minjeong,Kim Jung Ho,Song Joon Young,김신우,Kim Sang Il,Kim Youn Jeong,Park Dae Won,Park Boyoung,Choi Bo Youl,Choi Jun-Yong 대한감염학회 2023 Infection and Chemotherapy Vol.55 No.1
Background: Owing to antiretroviral therapy (ART), acquired immune deficiency syndrome (AIDS)-related mortality has significantly decreased. Retaining in care is an essential step for human immunodeficiency virus (HIV) care cascade. This study investigated the incidence of and risk factors for loss to follow-up (LTFU) in Korean people living with HIV (PLWH). Materials and Methods: Data from the Korea HIV/AIDS cohort study (including prospective interval cohort and retrospective clinical cohort) were analyzed. LTFU was defined as not visiting the clinic for more than 1 year. Risk factors for LTFU were identified using the Cox regression hazard model. Results: The study enrolled 3,172 adult HIV patients (median age, 36 years; male 92.97%). The median CD4 T cell count at enrollment was 234 cells/mm3 (interquartile range [IQR]: 85 - 373) and the median viral load at enrollment was 56,100 copies/mL (IQR: 15,000 - 203,992). The total follow-up duration was 16,487 person-years, and the overall incidence rate of LTFU was 85/1,000 person-years.In the multivariable Cox regression model, subjects on ART were less likely to have LTFU than subjects not on ART (hazard ratio [HR] = 0.253, 95% confidence interval [CI]: 0.220 - 0.291, P <0.0001). Among PLWH on ART, female sex (HR = 0.752, 95% CI: 0.582 - 0.971, P = 0.0291) and older age (>50: HR = 0.732, 95% CI: 0.602 - 0.890; 41 - 50: HR = 0.634, 95% CI: 0.530 - 0.750; 31 - 40: HR = 0.724, 95% CI: 0.618 - 0.847; ≤30: reference, P <0.0001) were associated with high rate of retention in care. The viral load at ART initiation ≥1,000,001 (HR = 1.545, 95% CI: 1.126 - 2.121, ≤10,000: reference) was associated with a higher rate of LTFU. Conclusion: Young and male PLWH may have a higher rate of LTFU, and an increased rate of LTFU may induce virologic failure.
Seong Hye,Choi Yunsu,Ahn Kyoung Hwan,Choi Jun Yong,Kim Shin-Woo,Kim Sang Il,Kee Mee-Kyung,Choi Bo Youl,Park Boyoung,Hyun Hak Jun,Yoon Jin Gu,Noh Ji Yun,Cheong Hee Jin,Kim Woo Joo,Song Joon Young 대한감염학회 2023 Infection and Chemotherapy Vol.55 No.4
Background: Prophylactic immunization is important for human immunodeficiency virus (HIV)-infected patients; however, there are insufficient data on the burden of vaccine-preventable diseases (VPDs), vaccination rates, and factors influencing vaccination. Materials and Methods: The incidence and prevalence of VPDs in HIV-infected patients between 2006 and 2017 were estimated using the Korean HIV/acquired immune deficiency syndrome (AIDS) cohort database. In addition, we evaluated the vaccination rates and influencing factors for vaccination in HIV-infected patients through multilevel analysis of clinico-epidemiological factors, immune status, and psychological status. A questionnaire survey was conducted among experts to determine whether they recommend vaccination for HIV-infected patients. Results: The incidence rates of hepatitis B virus (HBV) infection, herpes zoster, and anogenital warts were 1.74, 7.38, and 10.85 per 1,000 person-years, respectively. The prevalence of HBV infection and anogenital warts at enrollment was 4.8% and 8.6%, respectively, which increased to 5.3% and 12.0%, respectively, by 2017. In HIV-infected patients, HBV (21.7% in 2008, 56.3% in 2013, and 75.4% in 2017) and pneumococcal vaccination rates (3.0% in 2015, 7.6% in 2016, and 9.6% in 2017) increased annually, whereas the influenza vaccination rate remained similar by season (32.7 - 35.6%). In the multilevel analysis, peak HIV viral load (≥50 copies/mL: odds ratio [OR] = 0.64, 95% confidence interval [CI]: 0.44 - 0.93; reference, <50 copies/mL) was an influencing factor for pneumococcal vaccination, while nadir CD4 T-cell counts (200 - 350 cells/mm3: OR = 0.54, 95% CI: 0.38 - 0.76; <200 cells/mm3: OR = 0.89, 95% CI: 0.62 - 1.28; reference, ≥350 cells/mm3) was an influencing factor for HBV vaccination. Influenza vaccination was associated with male sex (OR = 1.94) and the number of antiretroviral therapy (ART) regimen change (OR = 1.16), but was not significantly associated with HIV viral load or CD4 T-cell counts. Most experts responded that they administer hepatitis A virus, HBV, pneumococcal, and influenza vaccines routinely, but not human papillomavirus (12.9%) or herpes zoster vaccines (27.1%). Conclusion: The burden of vaccine-preventable diseases was quite high in HIV-infected patients. Nadir CD4 T-cell counts, peak HIV viral loads, and the number of ART regimen change are significant factors related to vaccination. Considering the low vaccination rates for VPDs, there was a discordance between experts' opinions and real clinical practice in the medical field.
Soo Min Kim,Yunsu Choi,Bo Youl Choi,Minjeong Kim,Sang Il Kim,Jun Young Choi,Shin-Woo Kim,Joon Young Song,Youn Jeong Kim,Mee-Kyung Kee,Myeongsu Yoo,Jeong Gyu Lee,Bo Young Park 한국역학회 2020 Epidemiology and Health Vol.42 No.-
OBJECTIVES: The aim of effective data quality control and management is to minimize the impact of errors on study results by identifying and correcting them. This study presents the results of a data quality control system for the Korea HIV/AIDS Cohort Study that took into account the characteristics of the data. METHODS: The HIV/AIDS Cohort Study in Korea conducts repeated measurements every 6 months using an electronic survey administered to voluntarily consenting participants and collects data from 21 hospitals. In total, 5,795 sets of data from 1,442 participants were collected from the first investigation in 2006 to 2016. The data refining results of 2015 and 2019 were converted into the data refining rate and compared. RESULTS: The quality control system involved 3 steps at different points in the process, and each step contributed to data quality management and results. By improving data quality control in the pre-phase and the data collection phase, the estimated error value in 2019 was 1,803, reflecting a 53.9% reduction from 2015. Due to improvements in the stage after data collection, the data refining rate was 92.7% in 2019, a 24.21%p increase from 2015. CONCLUSIONS: Despite this quality management strategy, errors may still exist at each stage. Logically possible errors for the post-review refining of downloaded data should be actively identified with appropriate consideration of the purpose and epidemiological characteristics of the study data. To improve data quality and reliability, data management strategies should be systematically implemented.
암호통신 기반 사이버공격 탐지를 위한 AI/X-AI 기술연구 동향
이윤수(Yunsu Lee),김규일(Kyuil Kim),최상수(Sangsoo Choi),송중석(Jungsuk So) 한국정보보호학회 2019 情報保護學會誌 Vol.29 No.3
인터넷 상에서 개인정보보호 등 안전성 강화를 위해 암호통신이 지속적으로 증가하고 있다. 특히, 해커들도 사이버공격행위 은닉 및 탐지기법 우회를 목적으로 암호통신을 적극 활용하는 추세이다. 이러한 상황에서, 네트워크 트래픽 상에서 평문형태의 패턴매칭을 통해 사이버공격을 탐지하는 기존의 방법으로는 한계점에 당면한 상황이다. 따라서, 본 논문에서는 암호통신 기반 사이버공격을 효과적으로 탐지하기 위하여 인공지능 및 설명가능 인공지능 기술을 접목하기 위한 연구 · 개발 동향을 소개한다.